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  Quantitative Shape-Classification of Misfitting Precipitates during Cubic to Tetragonal Transformations: Phase-Field Simulations and Experiments

Lin, Y.-Y., Schleifer, F., Holzinger, M., Ta, N., Skrotzki, B., Kamachali, R. D., et al. (2021). Quantitative Shape-Classification of Misfitting Precipitates during Cubic to Tetragonal Transformations: Phase-Field Simulations and Experiments. Materials, 14(6): 1373. doi:10.3390/ma14061373.

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materials-14-01373-v2.pdf (Publisher version), 8MB
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materials-14-01373-v2.pdf
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2021
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 Creators:
Lin, Yueh-Yu1, Author
Schleifer, Felix1, Author
Holzinger, Markus1, Author
Ta, Na2, 3, Author              
Skrotzki, Birgit4, Author
Kamachali, Reza Darvishi2, 5, Author              
Glatzel, Uwe1, Author
Fleck, Michael1, Author
Affiliations:
1Metals and Alloys, University of Bayreuth, Prof.-Rüdiger-Bormann-Straße 1, 95447 Bayreuth, Germany, ou_persistent22              
2Theory and Simulation, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863392              
3School of Material Science and Engineering, University of Science & Technology Beijing, Beijing 100083, China, ou_persistent22              
4Federal Institute for Materials Research and Testing (BAM), 12205 Berlin, Germany, ou_persistent22              
5Federal Institute for Materials Research and Testing (BAM), Unter den Eichen 87, 12205, Berlin, Germany, ou_persistent22              

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Free keywords: Aluminum alloys; Copper alloys; Nickel alloys; Precipitation (chemical), Invariant moment; Material systems; Metallic alloys; Phase field models; Phase-field simulation; Precipitation strengthening; Shape classification; Shape deviations, Aspect ratio
 Abstract: The effectiveness of the mechanism of precipitation strengthening in metallic alloys de-pends on the shapes of the precipitates. Two different material systems are considered: tetragonal γ′′ precipitates in Ni-based alloys and tetragonal θ′ precipitates in Al-Cu-alloys. The shape formation and evolution of the tetragonally misfitting precipitates was investigated by means of experiments and phase-field simulations. We employed the method of invariant moments for the consistent shape quantification of precipitates obtained from the simulation as well as those obtained from the experiment. Two well-defined shape-quantities are proposed: (i) a generalized measure for the particles aspect ratio and (ii) the normalized λ2, as a measure for shape deviations from an ideal ellipse of the given aspect ratio. Considering the size dependence of the aspect ratio of γ′′ precipitates, we find good agreement between the simulation results and the experiment. Further, the precipitates’ in-plane shape is defined as the central 2D cut through the 3D particle in a plane normal to the tetragonal c-axes of the precipitate. The experimentally observed in-plane shapes of γ′′-precipitates can be quantitatively reproduced by the phase-field model. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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Language(s): eng - English
 Dates: 2021-03-12
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.3390/ma14061373
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Title: Materials
  Abbreviation : Materials
Source Genre: Journal
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Publ. Info: Basel : MDPI
Pages: - Volume / Issue: 14 (6) Sequence Number: 1373 Start / End Page: - Identifier: ISSN: 1996-1944
CoNE: https://pure.mpg.de/cone/journals/resource/1996-1944